The service seems pretty specifically designed for well-off commuters who take a cab to their jobs in Manhattan every day (I have not met them, but I’m sure they’re out there), but hypothetically, it’s an interesting idea, admitting your own cab over-dependence ahead of time and paying a set rate not to worry about it. If this were to expand (and, y’know, allow for unlimited travel in between different Brooklyn locations, not just to a set point on the other side of the East River), who among us would have the delicate balance of self-awareness and extravagance to just pony up ahead of time? If self knowledge is the unique curse of humans, may as well use it to minor logistical advantage, no?